<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>05.form_fields | KnockOut</title>
  <script src="../assets/knockout-3.5.1.js"></script>
</head>
<body>

  <input data-bind="hasFocus: isSelected" />
  <button data-bind="click: setIsSelected">获取焦点</button>
  <span data-bind="visible: isSelected">文本框获取焦点</span>

  <script type="text/javascript">
    var vm = {
      isSelected: ko.observable(false),
      setIsSelected: function() {
        this.isSelected(true);
      }
    };

    ko.applyBindings(vm);
  </script>

</body>
</html>
